Retraction mechanism and method for graft cover retraction
First Claim
1. A graft delivery system comprising:
- a graft cover retractor including;
a screw gear including at least one longitudinal slot; and
a drive and quick release assembly coupled to the screw gear,wherein the drive and quick release assembly slides along the at least one longitudinal slot to retract a graft cover affixed to the drive and quick release assembly;
said drive and quick release assembly rotates in a first rotational direction about the screw gear to retract the graft cover using the screw gear; and
said drive and quick release assembly transitions from rotating to sliding by rotating the drive and quick release assembly a fraction of a complete revolution in a second rotation direction that is opposite to the first rotation direction being used to retract the graft cover.
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Accused Products
Abstract
A stent or stent-graft delivery system includes a handle having a graft cover retractor having a screw gear and a drive and quick release assembly. The drive and quick release assembly allows a user to retract a graft cover by rotating the assembly in a first rotational direction about the screw gear. When the assembly is being rotated in a particular rotational direction, a partial revolution in the opposite rotational direction disengages the assembly from the screw gear, which is sensed by a change in the force required to rotate the assembly. With the assembly disengaged from the screw gear, the assembly can be slid along the screw so that the graft cover can be positioned more quickly. In transitioning from using the screw gear to sliding along screw gear, it unnecessary to push any button and unnecessary for the user to remove her/his hand from the assembly.
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Citations
18 Claims
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1. A graft delivery system comprising:
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a graft cover retractor including; a screw gear including at least one longitudinal slot; and a drive and quick release assembly coupled to the screw gear, wherein the drive and quick release assembly slides along the at least one longitudinal slot to retract a graft cover affixed to the drive and quick release assembly; said drive and quick release assembly rotates in a first rotational direction about the screw gear to retract the graft cover using the screw gear; and said drive and quick release assembly transitions from rotating to sliding by rotating the drive and quick release assembly a fraction of a complete revolution in a second rotation direction that is opposite to the first rotation direction being used to retract the graft cover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification